Dynamics BC task scheduler is only running once

I'm trying to run a Dynamics 365 BC CU2 service with task scheduler turned on. The task-scheduler is only running one's.

During this first run the tasks are executed, but it will not run tasks anymore that are scheduled for a later time.

The windows log doesn't show any errors. 

Does anyone have same experience and how to solve this problem,

Thanks in advance for suggestions.


Nick Lenting